Please note: Experient is the official housing provider for the ONS 43rd Annual Congress. ONS has worked diligently with the hotels in Washington, DC to establish room blocks for attendees and exhibitors. Improper solicitation of hotel reservations from any company or housing provider other than Experient is not approved by ONS. Reservations made by unaffiliated organizations may appear to be for lower rates, however they may be illegitimate, have unreasonable cancellation or change penalties, or be completely non-refundable. Please be aware of, and report any unauthorized solicitation to ONS